Новий механізм фокусування та підсилення акустичних хвиль, що генеруються металевими наночастинками в кристалічній ґратці
We will discuss a possible mechanism for the focusing and enhancement of acoustic waves generated by metal nanoparticles embedded in a crystal lattice under ultrashort laser excitation. In contrast to continuous-medium models, the discrete lattice framework naturally gives rise to oscillatory wave t...
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| Datum: | 2025 |
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| Hauptverfasser: | , |
| Format: | Artikel |
| Sprache: | English Ukrainian |
| Veröffentlicht: |
Publishing house "Academperiodika"
2025
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| Schlagworte: | |
| Online Zugang: | https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2023744 |
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| Назва журналу: | Ukrainian Journal of Physics |
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Ukrainian Journal of Physics| Zusammenfassung: | We will discuss a possible mechanism for the focusing and enhancement of acoustic waves generated by metal nanoparticles embedded in a crystal lattice under ultrashort laser excitation. In contrast to continuous-medium models, the discrete lattice framework naturally gives rise to oscillatory wave tails appearing behind the propagating front. These tails arise from the breakdown of Huygens principle in even-dimensional spaces. The atomic dynamics can be interpreted as evolving within a six-dimensional configuration space, where the continuous subspace represents intra-cell displacements and the discrete indices correspond to the positions of unit cells. This effect can lead to a local enhancement of longitudinal acoustic wave amplitudes at specific lattice sites without any increase in the driving laser pulse intensity. |
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